1. Read the paragraph. Use context clues to write a general definition for each underlined word. Use a dictionary to write an exact definition.
   
   Pollutants fill the air when fossil fuels are burned. Sometimes these air pollutants, smoke, are trapped in one location. Clouds made of water droplets and dust naturally occur close to the Earth ‘s surface during specific weather conditions. Fog can trap air pollutants in one area for long periods. This combination of natural and human factors creates smog.
   
   It affects living things and human-made objects. Smog traps carbon dioxide in parts of the atmosphere. The carbon dioxide traps heat close to the earth. Eventually, the carbon dioxide level will increase to a point where the additional heat will melt glaciers and change the climate and weather patterns.

Adapted from the “Intermediate Academic Upgrading-Science” learning packages; IA U-S 4.2

1. smog
   
   
   1. General definition —
      
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2. Fog
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